Temperature resistance coefficient of(α, Not thermal expansion)Iron

α20=0.0055

engineering prefixnano

1x10^-9

engineering prefixpico

1x10^-12

engineering prefix femto

1x10^-15

engineering prefix atto

1x10^-18

A substance that possesses magnetism property and can attract iron and other ferromagnetic materials including ferrites (non metallic ferromagnetic materials)

Magnet

32

The place where magnet was discovered

Magnesia

33

the magnet is called _____ by ancient people

Lodestar (early guiding stars)Iron oxide called magnetite (Fe3O4)

34

It is produced by electric current rather than a natural magnet

Electromagnetism

35

Who discovered the phenomenon of electromagnetism?

Hans Christian Oersted (april 21, 1820)

36

A property possessed by magnetic materials by the virtue of which residual magnetism is possible

Retentivity

37

The magnetism left after the removal of the magnetizing force

Residual Magnetism

38

The opposite of retentivity

Coercivity

39

It is required to counter retentivity to eliminate residual magnetism

Coercive force

40

How can a magnet lose its properties?

Tax evasion. jk, When it is heated, hammered, or dropped from a height

41

Tractive/Lifting force of a magnet formula

F=.5(AB^2)/u0A=total area of contact, m^2B=flux density, Wb/m^2 or T`

42

What is the first law of magnetism

Like poles repel and unlike poles attract

43

What is the second law of magnetism

A magnetic field always tends to arrange itself that the greatest number of lines of force are created

44

What is the domain theory of magnetism

The magnetic property of a material is due to the electron's spin direction. In non-magnetic materials, the net magnetic field is zero since electron's spin cancels each other, while in magnetic materials the magnetic fields are aligned thus forming small bar magnet

45

What is the molecular/Weber theory of Magnetism?

The molecules of a material are magnets themselves and magnetization consists of rearrangement of the molecules in a way that all north poles point in the same direction, as such with the south pole

46

Magnetic fields originate in _______ and terminate in _________

North pole, South pole

47

What do you call the property when the magnetic flux spreads in the air?

Fringing

48

What is Coulomb's first law?

THe force of attraction or repulsion of two magnetic pole is directly proportional to their strength

49

What is Coulomb's second law?

The force of attraction between two poles is inversely proportional to the square of the distance between them

E-Field BETWEEN equally, but oppositely charged plates

E = ρs / εo

E-Field OUTSIDE equally, but oppositely charged plates

E = 0 (except at the ends of the plates, where the fringe field exists)

104

What does it mean when Coloumb's force is Conservative?

If a particle moves around an E-Field, and will return to its initial position, the summation of work done by the charge to oppose the E-Field as it moves, minus the work done by the E-Field to the particle when the particle moves along with the E-Field, is equal to zero

105

Formula for Work done by a particle from point A to B under the influence of an E-Field

FINAL FORMULA:

L = μ(N²)A / l (in Henrys)"LUNAL"

THEORY: a supplement to Faraday's Law, where it indicates that the polarity the induced EMF in the presence of a changing magnetic field

LENZ LAW:

V = -NdΦ/dt

139

The effect observed when electrons are pushed to one side of a conductor that carries current, due to the presence of a magnetic field, Polarizing the conductor, making one side positive, and another negative, that results to a voltage across the width of the conductor